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Simplifying -3x + 3(4x + -5) = 21 Reorder the terms: -3x + 3(-5 + 4x) = 21 -3x + (-5 * 3 + 4x * 3) = 21 -3x + (-15 + 12x) = 21 Reorder the terms: -15 + -3x + 12x = 21 Combine like terms: -3x + 12x = 9x -15 + 9x = 21 Solving -15 + 9x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 9x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 9x = 21 + 15 9x = 21 + 15 Combine like terms: 21 + 15 = 36 9x = 36 Divide each side by '9'. x = 4 Simplifying x = 4
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